Upper portion of boot



FIG. 1 is a front perspective view of an upper portion of boot showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a right side elevational view thereof.

The broken lines with alternating long and short line strokes are for illustrative purposes only and form no part of the claimed design. The broken lines without alternating long and short line strokes form a part of the claimed design. 

The ornamental design for a upper portion of boot, as shown and described. 